Fix cluster artifacts and negative light #12414

Job	Run time
📊 Static checks / Code style, file formatting, and docs	48s
🍎 macOS / Editor (target=editor, tests=yes)	5m 19s
🍎 macOS / Template (target=template_release)	3m 45s
🐧 Linux / Editor w/ Mono (target=editor)	3m 49s
🐧 Linux / Editor with doubles and GCC sanitizers (target=editor, tests=yes, dev_build=yes, scu_build=yes, precision=double, use_asan=yes, use_ubsan=yes, linker=gold)	16m 37s
🍏 iOS / Template (target=template_release)	5m 25s
🐧 Linux / Editor with clang sanitizers (target=editor, tests=yes, dev_build=yes, use_asan=yes, use_ubsan=yes, use_llvm=yes, linker=lld)	10m 10s
🐧 Linux / Editor with ThreadSanitizer (target=editor, tests=yes, dev_build=yes, use_tsan=yes, use_llvm=yes, linker=lld)	10m 7s
🤖 Android / Template (target=template_release)	4m 15s
🐧 Linux / Template w/ Mono (target=template_release)	1m 9s
🌐 Web / Template (target=template_release)	1m 21s
🐧 Linux / Minimal template (target=template_release, everything disabled)	56s
🏁 Windows / Editor (target=editor, tests=yes)	11m 54s
🏁 Windows / Template (target=template_release)	6m 24s
🪲 Godot CPP / Build and test Godot CPP	9m 50s
	1h 31m 49s

Provide feedback